A) If you deposit 5 dollars per day for five days, you can show this by 5 x 5 = $25. If you account currently has -$15 and you are adding $25, you will have $10.
B) If you now have $10 after you made all you deposits, you will need 5 days to withdraw $2 from your account until $0. This is because you can equally divide $10 / $2 to equal 5 days.
X=2 You have to first distribute the two and then you have to move the variable to one side of the equation and the number to the other. The work is attached below